JPH03271730A - Camera with electronic finder - Google Patents

Abstract

PURPOSE:To detect the blurring of a camera, unarrival of strobe light, etc. by displaying a still picture obtained by carrying out image pickup at the same shutter speed and timing as those for an object-picture imprinted on a film on an electronic finder. CONSTITUTION:A picture signal corresponding to the same object-light (time and timing are exactly the same) as object-light with which a film is actually exposed is fetched from an image pickup device 12. The time and timing can be detected from the speed determined at the time of photographing and a shutter release. The picture signal fetched in such a manner is stored in a storage means 22, and is properly read from the storage means 22 after the photographing. It is displayed as a still picture on the electronic finder 26. Therefore, a picture which is more similar to an object-picture imprinted on the film can be displayed on the electronic finder 26 immediately after the photographing. Thus, the blurring of the camera, unarrival of strobe light, etc. all of which occur at the time of photographing, can be detected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a silver halide camera, and more particularly to a camera with an electronic viewfinder that displays a subject image on an electronic viewfinder.

[Conventional technology]

-II, electronic viewfinders are used in video cameras, but a silver halide camera using an electronic viewfinder has also been proposed (Japanese Patent Laid-Open No. 63-284528).
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This camera with an electronic viewfinder has a function that stores the image signal sent from the CCD at the time of shirt release in the memory, and then displays the still image at the time of shooting on the liquid crystal display based on the image signal stored in the memory. We are prepared.

[Problem to be solved by the invention]

However, in the above-mentioned conventional camera with an electronic viewfinder, the image signal sent out from the CCD is simply stored in the memory in synchronization with the shutter release, so the image signal is not displayed on the liquid crystal display based on the image signal stored in the memory. Still images cannot be said to accurately represent the image of the subject captured on film.

That is, camera shake, strobe arrival detection, etc. cannot be accurately determined using the above-mentioned still image.

The present invention has been made in view of these circumstances, and after photographing an image that is closer to the image of the subject recorded on the film,
It is an object of the present invention to provide a camera with an electronic viewfinder that can immediately display information on the electronic viewfinder and thereby detect camera shake during photographing, flash failure, etc.

[Means to solve problems]

In order to achieve the above object, the present invention focuses light from a subject on a light receiving section of an imaging device, displays the subject image on an electronic viewfinder based on an image signal read out from the imaging device, and opens and closes a shutter. A camera with an electronic viewfinder that exposes a silver halide film to light from a subject by control, comprising: means for detecting the shutter speed and timing of the shutter; a storage means for storing image signals for one screen; and a means for detecting the shutter speed and timing of the shutter; means for reading out from the imaging device only an image signal corresponding to the subject light incident on the light receiving section of the imaging device at the same time and timing as the shutter speed and timing, and storing this image signal in the storage means; The present invention is characterized by comprising means for reading an image signal from a storage means and displaying a still image on the electronic viewfinder based on the video signal.

[Effect]

According to the present invention, an image signal corresponding to the same subject light (subject light having exactly the same time and timing) as the subject light that actually exposed the film is extracted from the imaging device. Note that the time and timing can be detected from the speed and shirt release determined at the time of photographing. The image signal extracted as described above is stored in a storage means, and after photographing, it is appropriately read out from the storage means and displayed on the electronic viewfinder as a still image.

〔Example〕

Preferred embodiments of a camera with an electronic viewfinder according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a block diagram of essential parts showing an embodiment of a camera with an electronic viewfinder according to the present invention. This camera is a silver-halide type camera that projects an image of a subject onto a silver-halide film through a photographic lens (not shown).

In the figure, light from the subject is transmitted through the finder lens 10.
An image is formed on the light receiving section of a solid-state imaging device (CCD) 12 via the .

Each of the two-dimensionally arranged photoelectric conversion elements of the CCD 12 has
A signal corresponding to the intensity of light incident on that portion is generated, and this signal charge is accumulated in each photoelectric conversion element for an appropriate period of time based on an LCDW movement signal from a system controller 14, which will be described later. Then, the signal charges accumulated in this manner are sequentially read out and applied to the signal processing circuit 16.

The signal processing circuit 16 sequentially converts the signal charges manually input from the CCD into image signals for liquid crystal display based on the synchronization signal from the system controller 14, and outputs this to the terminal 18A of the changeover switch 18. It is output to the memory 22 via the D converter 20.

The memory 22 stores image signals for one screen and outputs the stored image signals.
The digital image signal for one screen is stored manually from the A/D converter 20 based on a write command applied at an appropriate timing from 4 to 4.

The digital image signals stored in the memory 22 are read out repeatedly in sequence and outputted to the terminal 18B of the changeover switch 18 via the A/D converter 24.

The changeover switch 18 switches and connects the movable contact piece 18C to terminal A or terminal B based on a switch changeover signal from the system controller 14, and outputs the image signal input to terminal A or terminal B to a liquid crystal display (LCD) 26. do.

The LCD 26 is disposed as a liquid crystal finder on the back of the camera, for example, and is driven by an LCD drive signal applied from the system controller 14, and displays the finder image on a liquid crystal display based on an image signal input manually via the changeover switch 18.

Next, the operation of the system controller 14 will be explained.

A signal indicating a shutter speed set based on the output of an AE sensor (not shown) that measures subject brightness and a release signal synchronized at the time of shirt release are applied to the system controller 14.

When the system controller 14 is not inputting a release signal, it switches the movable contact piece 18C of the changeover switch 18 to terminal A, and also changes the CC so that the charge accumulation time in the CCD 12 is one vertical period (one field period).
Outputs the D drive signal.

Therefore, the signal charge accumulated in the photoelectric conversion element of the CCD 12 during one field period is sequentially read out during the next one field period, and after being converted into an image signal for liquid crystal display by the signal processing circuit 16. , LCD2 via the changeover switch 18
Added to 6.

Thereby, the finder image of the moving image is displayed on the LCD 26.

On the other hand, when a release signal is manually input to the system controller 14, the system controller 14 controls the CCD 12 based on the signal indicating the shutter speed input at that time.
Match the charge accumulation time at its shutter speed,
Furthermore, the CCD 12 is controlled so as to be synchronized with the release signal at the start of charge accumulation.

That is, the system controller 14 causes the vertical transfer CCD to read out unnecessary charges accumulated in each photoelectric conversion element of the CCD 12 in synchronization with the release signal, starts accumulation of new signal charges, and also causes the vertical transfer CCD Sweep out all the unnecessary charges read out from the drain,
After the time of the shutter speed has elapsed, the signal charges accumulated during that time are read out by the vertical transfer CCD.

Note that the signal charge read out to the vertical transfer CCD is sequentially transferred in the direction of the horizontal transfer CCD every horizontal period (IH), as in normal readout, and is transferred to the final stage of the vertical transfer CCD. The signal charges are sequentially transferred to the horizontal transfer stage every horizontal retrace period, and are sequentially taken out during the next horizontal scanning period.

The system controller 14 then processes the signal output from the CCD 12 and the signal processing circuit 16 and the A/
The digital image signal applied to the memory 22 via the D converter 20 is stored in the memory 22, and the movable contact piece 18C of the changeover switch 18 is switched to the terminal 18B, and the image signal read from the memory 22 is transferred to the D/A converter. 24 and the changeover switch 18 to output to the LCD 26.

As a result, the LCD 26 displays a still image having the same information as the subject image captured on the film at the time of shirt release.

In addition, when switching from the still image to a moving image, for example, it is possible to switch the changeover switch 18 when the shirt release button is released from the fully pressed state, but it is also possible to switch the changeover switch 18 manually. good. Further, in this embodiment, the finder lens 10 is used, but a configuration in which the light passing through the photographing lens is separated by a beam splitter and guided to the CCD 12 may also be used.

〔Effect of the invention〕

As explained above, according to the camera with an electronic viewfinder according to the present invention, a still image taken at the same shutter speed and timing as the subject image captured on the film can be displayed on the electronic viewfinder, thereby preventing camera shake. It is possible to detect whether the strobe has not arrived, etc., and it is possible to judge at the time of photographing whether or not the photographing has failed, and if the photographing has failed, it is possible to take the photograph again, giving the photographer a sense of security.

[Brief explanation of drawings]

FIG. 1 is a block diagram of essential parts showing an embodiment of a camera with an electronic viewfinder according to the present invention. 10... Finder lens, 2... Solid-state imaging device (CCD), 4... System controller,

Claims (1)

[Claims] Light from the subject is focused on the light receiving section of an imaging device, the subject image is displayed on an electronic viewfinder based on the image signal read from the imaging device, and the shutter is controlled to open and close. A camera with an electronic viewfinder that exposes a silver halide film to light from the camera, comprising means for detecting the shutter speed and timing of the shutter, storage means for storing image signals for one screen, and the detected shutter speed and timing. means for reading out from the imaging device only an image signal corresponding to the subject light incident on the light receiving section of the imaging device at the same time and timing as and storing the image signal in the storage means; A camera with an electronic viewfinder, comprising: means for reading out a still image and displaying a still image on the electronic viewfinder based on the video signal.